A remarkable discovery has been made in the Indian Ocean, where researchers have identified nearly 150 new species of marine life, including a fascinating sponge crab that wears marine invertebrates as a hat. This finding adds significant value to our understanding of the ocean’s biodiversity, particularly in the unexplored depths of the seas.
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The newly discovered creatures were unearthed during two scientific expeditions aboard the RV Investigator, which took place in 2021 and 2022. The voyages traversed 22 undersea mountains, or seamounts, situated near the remote Keeling Islands, approximately 1,300 miles northwest of Australia. Experts from the Australian Museum, the Commonwealth Scientific and Industrial Research Organisation (CSIRO), and Museums Victoria collaborated on the project, collecting over 1,000 specimens during their explorations.
Dr. Claire Rowe, a co-author of the paper detailing the findings, revealed that of the species collected, it is believed that 149 were previously unknown to science. The research, published in the June 2026 edition of *Deep Sea Research Part II: Topical Studies in Oceanography*, highlights the richness of marine life hidden beneath the waves. The specimens have been distributed across various museums in Australia for further study and identification.
Rowe emphasised the importance of preserving these specimens for future research, stating, “Storing these specimens in museum collections is such a valuable resource as they represent the biodiversity at this point in time, allowing people to continue to research them well into the future.” The eccentric sponge crab is just one of the unique findings, alongside robust sea stars and delicate translucent worms.
One of the most astonishing discoveries includes a tiny annelid worm living at depths exceeding 16,000 feet, making it one of the deepest-dwelling organisms recorded from the Investigator. Dr. Elena Kupriyanova, another co-author of the study, remarked on the surprising presence of such resilient animals in the profound depths of the sea, where most species tend to evolve into softer-bodied forms.
Kupriyanova described the seamounts as “stepping stones” for marine organisms, suggesting that these habitats are interconnected, allowing species to migrate and adapt over time. Her insights reinforce the idea that seamounts can host both unique and commonly found marine creatures, offering a snapshot of the rich diversity present across global underwater landscapes.
During the Investigator’s voyages, scientists also catalogued other intriguing species, including a painted hornshark and a distinctive sea cucumber named O’Loughlin’s sea cucumber, which features ten primary pairs of legs and numerous tube-like projections along its back. These discoveries not only enhance our knowledge of marine biodiversity but also hold potential implications for conservation efforts.
The findings from these explorations are crucial for managing Australia’s remote marine parks and addressing the impact of human activities on these ecosystems. Dr. Rowe remarked on the privilege of sampling such depths, highlighting that our understanding of the deep-sea environment is still quite limited. The research underscores the ongoing necessity of expeditionary work to safeguard Australia’s marine biodiversity.
A representative from CSIRO noted that biodiversity survey missions provide foundational knowledge for marine park managers, such as Parks Australia, which is essential for effective management of Australia’s expansive marine network. With much of the deep ocean still uncharted, these surveys play a vital role in the global understanding of marine biodiversity.
These recent findings come on the heels of another announcement from scientists involved in the Nippon Foundation-Nekton Ocean Census, who reported the discovery of over 1,000 new species of ocean life, including peculiar organisms like a “ghost shark” and symbiotic bristle worms residing in a unique glass-like habitat.
As our oceans face numerous threats, including climate change and pollution, ongoing research and exploration into these vast and largely unexplored waters is imperative. Only through dedicated scientific inquiry can we fully grasp the complexity of ocean ecosystems and endeavour to protect them for future generations.